scholarly journals Assessment of the Impact of Probe Head Hysteresis on the Accuracy of Five-Axis Coordinate Measuring Systems

2017 ◽  
Vol 11 (3) ◽  
pp. 277-282
Author(s):  
Piotr Gąska ◽  
Maciej Gruza ◽  
Adam Gąska ◽  
Wiktor Harmatys ◽  
Jerzy Sładek
Keyword(s):  
Measuring Systems ◽  
Five Axis ◽  
The Impact ◽  
Probe Head

scholarly journals Selection of Optimal Path Control Algorithms for Probe Heads Used on Five-Axis Measuring Systems

2018 ◽  
Vol 8 (12) ◽  
pp. 2455 ◽  
Author(s):  
Adam Gąska ◽  
Piotr Gąska ◽  
Maciej Gruza ◽  
Jerzy Sładek
Keyword(s):  
Path Planning ◽  
Measurement Errors ◽  
Scientific Practice ◽  
Optimal Path ◽  
Measuring Systems ◽  
Factors Affecting ◽  
Path Control ◽  
Five Axis ◽  
The Impact ◽  
Selection Of

The utilization of rotational movements of a probing system during points measurementscontributes to the reduction of measurement duration and increases measurement repeatability.However, knowledge on such behavior and accuracy of probing systems is still unsatisfactory.Machines combined with articulating probing systems that have the ability of continuous indexationbecome redundant systems, which means that the same points can be measured using almost infinitemutual configurations of the machine and probe stylus orientations. Therefore, the proper selectionof inspection path planning method becomes one of the main factors affecting the accuracy of themeasurement. It is possible to assess the impact of this factor on the accuracy of the measurementby comparing the results of the measurements of gauge elements, which are done using differentpath controlling algorithms. After that, the best method for basic measuring tasks can be chosenin order to reduce measurement errors. Measurements of the multi-feature check gauge, using thedefault method for path planning and those chosen on the basis of described experiments, indicatesthat the improvement of accuracy may reach several microns. Results presented in this paper can bedirectly transferred to similar systems and measuring tasks, which are commonly met in industrialand scientific practice.

scholarly journals Assessment of impact of stylus length on measurement accuracy for 5-axis coordinate measuring systems

Mechanik ◽  
2017 ◽  
Vol 90 (11) ◽  
pp. 1027-1029
Author(s):  
Piotr Gąska ◽  
Adam Gąska ◽  
Maciej Gruza ◽  
Ksenia Ostrowska ◽  
Jerzy Sładek
Keyword(s):  
Measurement Accuracy ◽  
Measuring Systems ◽  
The Impact ◽  
Probe Head

Length of stylus used during measurements performed on CMMs is one of the important factors which affect their accuracy. Authors decided to investigate how this factor affects the measurement done in 5-axis mode when articulated probe head is used for adding 2 supplementary rotary movements during measurements. Described research utilize well-known methodology based on measurement of material standards. The impact of the stylus length on obtained results was estimated and conclusions were drawn.

scholarly journals Simulation Model for Correction and Modeling of Probe Head Errors in Five-Axis Coordinate Systems

2016 ◽  
Vol 6 (5) ◽  
pp. 144 ◽  
Author(s):  
Adam Gąska ◽  
Piotr Gąska ◽  
Maciej Gruza
Keyword(s):  
Simulation Model ◽  
Coordinate Systems ◽  
Five Axis ◽  
Probe Head

scholarly journals Susceptibility of surface texture parameters to acquisition point clouds with digital data processing of data from optical measuring systems

2019 ◽  
Vol 252 ◽  
pp. 03020 ◽  
Author(s):  
Emilia Bachtiak-Radka ◽  
Sara Dudzińska ◽  
Daniel Grochała ◽  
Stefan Berczyński
Keyword(s):  
Data Processing ◽  
Surface Texture ◽  
Surface Characteristics ◽  
Point Clouds ◽  
Digital Processing ◽  
Digital Data ◽  
Measuring Systems ◽  
Optical Measuring ◽  
Digital Data Processing ◽  
The Impact

Digital processing of the recorded point clouds on innovative surfaces could facilitate the operator’s planning of the metrological process and give more freedom in the assessment of the surface texture. The current state of knowledge about surface characteristics, precision and quality of measurements and especially the repeatability of measurements – not only in the laboratory environment but also in the industry pose a big challenge. The paper presents research works related to the identification of the impact of the method of acquisition point clouds using digital data processing on surface texture. The main assumption of the paper was to carry out, according to the prepared plan of the experiment, the series of sample measurements with the use of the optical measuring systems AltiSurf A520 in the Laboratory of Surface Topography at the West Pomeranian University of Technology in Szczecin. The next task was to determine the impact of the digital data processing strategy in order to identify the significance of the impact (conditions and methods of filtration), which in practice largely determines the repeatability and reproducibility of the parameter values of the geometry surface structure.

Tool Path Generation Algorithm Based on the Double Spiral Filling Curve

2012 ◽  
Vol 190-191 ◽  
pp. 790-793 ◽  
Author(s):  
Jiang Bo Gong ◽  
Lei Luo ◽  
Jun Hu
Keyword(s):  
Tool Path ◽  
Machining Process ◽  
Space Filling ◽  
Space Filling Curve ◽  
Curve Method ◽  
Double Spiral ◽  
The Right ◽  
Filling Curve ◽  
Five Axis ◽  
The Impact

The steering frequent problems in the five-axis NC machining tool path planning based on space-filling curve method was researched, then a double spiral space-filling curve was proposed. Owing to frequently reverse, it was adopted that an arc on transition instead of the right angle, so the impact in tool and the part in machining process was reduced. Combined with the free surface, the plane filling curve with the surface parameters corresponding to the mapping on the surface thereby generated the idea of machining tool paths. Finally, the method was used for a specific surface, and the effectiveness of the method was verified.

Nonlinear Error Compensation Based on the Optimization of Swing Cutter Trajectory for Five-Axis Machining

2021 ◽  
Author(s):  
Liangji Chen ◽  
Jinmeng Tang ◽  
Wenyi Wu ◽  
Zisen Wei
Keyword(s):  
Machine Tool ◽  
Error Compensation ◽  
Rotation Axis ◽  
Kinematic Model ◽  
Free Form ◽  
Nonlinear Error ◽  
Center Point ◽  
Parameterized Model ◽  
Five Axis ◽  
The Impact

Abstract In order to solve the problem of deviation between actual and theoretical machining paths due to the presence of rotation axis in five-axis machining, an interpolation algorithm based on the optimization of swing cutter trajectory and the method of corresponding nonlinear error compensation are proposed. Taking A-C dual rotary table five-axis machine tool as an example, the forward and reverse kinematic model of the machine tool is established according to the kinematic chain of the machine tool. Based on the linear interpolation of rotary axis, the generation mechanism of nonlinear error is analyzed, the modeling methods of cutter center point and cutter axis vector trajectory are proposed respectively, and the parameterized model of swing cutter trajectory is formed. The formula for the nonlinear error is obtained from the two-dimensional cutter center point trajectory. According to the established model of swing cutter trajectory, the synchronous optimization method of cutter center point trajectory and cutter axis vector trajectory is proposed, and the nonlinear error compensation mechanism is established. First, pre-interpolation is performed on the given cutter location data to obtain a model of the swing cutter trajectory for each interpolated segment. Then the magnitude of the nonlinear error is calculated based on the parameters of the actual interpolation points during formal interpolation, and the interpolation points with large errors are compensated for the nonlinear error. The simulation results show that the proposed method can effectively reduce the impact of nonlinear errors on machining, and is of high practical value for improving the accuracy of cutter position and the quality of complex free-form machining in five-axis machining.

Effect of tilting angle on the dynamics of tilting table driven by worm and worm wheel

2014 ◽  
Vol 229 (10) ◽  
pp. 1782-1791 ◽  
Author(s):  
Wenming Wei ◽  
Jun Zhang ◽  
Dun Lu ◽  
Wanhua Zhao
Keyword(s):  
Natural Frequency ◽  
Transmission System ◽  
Impact Testing ◽  
Torsional Stiffness ◽  
Axial Stiffness ◽  
Parameter Method ◽  
Worm Wheel ◽  
Five Axis ◽  
The Impact ◽  
Tilting Table

The dynamics of tilting table behaves differently during five-axis machining due to the constant changes of the position of its center of mass which leads to different forces acting on parts of the transmission system. In this research, the lumped parameter method is used to model the dynamics of tilting table driven by worm and worm wheel in the tilting direction, where the varying stiffness of the transmission system at different tilting angles is considered. The impact testing experiments of tilting table system with tilting angles from 0° to 90° are also performed to verify the analytical model. The results from sensitivity analysis show that the three stiffnesses have a great effect on the variation of system natural frequency in the tilting direction, including the equivalent tangential meshing stiffness of worm and worm wheel, the torsional stiffness of worm wheel shaft, and the axial stiffness of worm supporting bearings. Moreover, the variations of system natural frequency with the three stiffnesses at different tilting angles are further investigated.

Experimental Study on the Formation Mechanism of Serrated Chip of TC11 Titanium Alloy

2016 ◽  
Vol 693 ◽  
pp. 767-774
Author(s):  
Liang Wen ◽  
Chang Qi Yang ◽  
Qiu Lin Niu ◽  
Wei Wei Ming ◽  
Ming Chen
Keyword(s):  
Titanium Alloy ◽  
Feed Rate ◽  
Cutting Speed ◽  
Cnc Machine ◽  
Dry Cutting ◽  
Serrated Chip ◽  
Tc11 Titanium Alloy ◽  
Serrated Chips ◽  
Five Axis ◽  
The Impact

Serrated chips were a universal phenomenon and it had a significant effect on cutting process. In this paper, single tooth dry cutting of TC11 titanium alloy were conducted on a five-axis CNC machine using Stellram milling cutter with a diameter of 32 mm. Both chip macroscopic morphology and microcosmic morphology of TC11 titanium alloy were studied in-depth examining the impact of cutting speed and feed rate to the serrated chips. The results showed that: with the increase of cutting speed, the chip morphology of titanium alloy TC4 experienced a change process from the hair bar to a “C” shape and then become a long strip. The critical cutting speed of TC11 for serrated chips was found at 80 m/min and the critical feed rate to form serrated chip was defined as 0.05mm/z. With the increasing of cutting speed, the extent of chip serration was significantly enhanced. Increasing cutting speed can decrease the feed rate to form serrated chips.

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